English   español  
Por favor, use este identificador para citar o enlazar a este item: http://hdl.handle.net/10261/122981
Compartir / Impacto:
Estadísticas
Add this article to your Mendeley library MendeleyBASE
Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Título

Twenty-year advanced DInSAR analysis of severe land subsidence: The Alto Guadalentín Basin (Spain) case study

AutorBonì, Roberta; Herrera, Gerardo; Meisina, Claudia; Notti, Davide; Béjar-Pizarro, Marta; Zucca, Francesco; González Méndez, Pablo José ; Palano, Mimmo; Tomás, Roberto; Fernández Torres, José ; Fernández-Merodo, José Antonio; Mulas, Joaquín; Aragón, Ramón; Guardiola-Albert, Carolina; Mora, Óscar
Palabras claveLand subsidence
Persistent Scatterer Interferometry (PSI)
Spatio-temporal analysis
Lorca
Groundwater level
GPS
Fecha de publicación11-ago-2015
EditorElsevier
CitaciónEngineering Geology, 198: 40–52 (2015)
ResumenA twenty-year period of severe land subsidence evolution in the Alto Guadalentín Basin (southeast Spain) is monitored using multi-sensor SAR images, processed by advanced differential interferometric synthetic aperture radar (DInSAR) techniques. The SAR images used in this study consist of four datasets acquired by ERS-1/2, ENVISAT, ALOS and COSMO-SkyMed satellites between 1992 and 2012. The integration of ground surface displacement maps retrieved for different time periods allows us to quantify up to 2.50 m of cumulated displacements that occurred between 1992 and 2012 in the Alto Guadalentín Basin. DInSAR results were locally compared with global positioning system (GPS) data available for two continuous stations located in the study area, demonstrating the high consistency of local vertical motion measurements between the two different surveying techniques. An average absolute error of 4.6 ± 4 mm for the ALOS data and of 4.8 ± 3.5 mm for the COSMO-SkyMed data confirmed the reliability of the analysis. The spatial analysis of DInSAR ground surface displacement reveals a direct correlation with the thickness of the compressible alluvial deposits. Detected ground subsidence in the past 20 years is most likely a consequence of a 100–200 m groundwater level drop that has persisted since the 1970s due to the overexploitation of the Alto Guadalentín aquifer system. The negative gradient of the pore pressure is responsible for the extremely slow consolidation of a very thick (> 100 m) layer of fine-grained silt and clay layers with low vertical hydraulic permeability (approximately 50 mm/h) wherein the maximum settlement has still not been reached.
Versión del editorhttp://dx.doi.org/10.1016/j.enggeo.2015.08.014
URIhttp://hdl.handle.net/10261/122981
DOI10.1016/j.enggeo.2015.08.014
ISSN0013-7952
Aparece en las colecciones: (IGEO) Artículos
Ficheros en este ítem:
Fichero Descripción Tamaño Formato  
EG_2015_198_40.pdf3,09 MBAdobe PDFVista previa
Visualizar/Abrir
Mostrar el registro completo
 

Artículos relacionados:


NOTA: Los ítems de Digital.CSIC están protegidos por copyright, con todos los derechos reservados, a menos que se indique lo contrario.